اكْتُبُوا مَا رَأَيْتُمْ، وَلَا تَكْتُبُوا مَا تَظُنُّونَهُ مُشَاهَدًا.
Record what you saw, and do not present what you merely suppose as an observation.
The commands serve practical guidance. An imperative need not always be an authoritarian order, and a prohibition does not by itself declare a religiously forbidden act; the speaker’s role and purpose matter.
The two requests are appropriately coordinated because they address one purpose: the integrity of the record. Their shared instructional topic provides an intelligible link.